I just find that Akelpad 4.xx opens files much slower than 3.xx, the situation is worse when Word Wrap function is enabled.

When opening a large text file, Akelpad 4.xx will show a loading progress indicator at status bar. The larger file, the longer time and program looks like frozen. When resizing the window (with Wrap enabled), I have to wait for it again which makes it unusable.

Speed of open file is slower than 3.5.6.
The text file in GB2312, filesize > 3MB.

It is important to make speed tests with caret at the end of file (open file first time, set caret to the end of file, exit and open file again). "Remember caret position" should be turned on.
AkelPad 3.x can "loads" the file faster, but actually it load only some part of text and other part is loaded in background (only when word wrap mode is off). You can make sure in this by setting the caret at the end of a file and reopen it.

With word wrap OFF, the speed in Akelpad 4.xx is acceptable, though 3.xx is still leading.
With word wrap ON, Akelpad 3.xx loaded the file quick. Akelpad 4.xx had to wait for the loading indicator. Same situation when resizing window.

So is there any possibility to "partially" load file in Akelpad 4.xx especially when word wrap is ON just like it did in 3.xx?

What's the codepage of your test file?
When opening a unicode file or file in western language (eg. English), both are OK for me, but when the target file is in GB2312, things are different when wrap is ON.